Polyaminomethylenephos phonate derivatives

Abstract

In one embodiment, a scale inhibitor comprising at least one polymethylenephosphonate derivative having the following formula: wherein n is a number, wherein M is hydrogen or a cation, wherein R 1 , R 2 , and R 3 are each independently selected from the group consisting of CH 2 PO 3 M 2 , CH 2 R 4 , wherein R 4 is CHOHCH 3 , CHOHCH 2 Cl, or CHOHCH 2 OH, (CH 2 ) m SO 3 M, wherein m is 3 or 4, and CH 2 CH 2 R 5 , wherein R 5 is CONH 2 , CHO, COOR 6 , COOX, or CN, wherein R 6 is CH 3 or C 2 H 5 , and wherein X is an alkali metal or ammonium, and wherein at least one of R 1 , R 2 , and R 3 is not CH 2 PO 3 M 2 . In another embodiment, a method for inhibiting scale formation in water, and in still another embodiment, a method for sequestering iron ions in a water systems, each of the methods comprising the step of providing the water with the above described polymethylenephosphonate derivative.

1. A scale inhibitor comprising at least one polymethylenephosphate derivative having the following formula: 
       
         
           
           
               
               
           
         
         wherein n is an integer comprised between 2 and 15000, 
         wherein M is a hydrogen or a cation, 
         wherein R 1 , R 2 , and R 3  are each independently selected from the group consisting of,
 CH 2 PO 3 M 2 , 
 CH 2 R 4 , wherein R 4  is CHOHCH 3 , CHOHCH 2 Cl, or CHOHCH 2 OH, 
 (CH 2 ) m SO 3 M, wherein m is 3 or 4, and 
 CH 2 CH 2 R 5 , wherein R 5  is CONH 2 , CHO, COOR 6 , COOX, or CN, wherein R 6  is CH 3  or C 2 H 5 , and wherein X is an alkali metal or ammonium, and 
 
         wherein at least one of R 1 , R 2 , and R 3  is not CH 2 PO 3 M 2 . 
       
     
     
       2. The scale inhibitor according to  claim 1 , wherein at least one of the CH 2 PO 3 M 2  moieties in a terminal position on the molecule is replaced by a moiety selected from the group consisting of CH 2 R 4 , (CH 2 ) m SO 3 M, and CH 2 CH 2 R 5 . 
     
     
       3. The scale inhibitor of  claim 1 , wherein the polyaminomethylenephosphonate derivative is produced by a process of phosphonomethylation of polyamine derivatives employing the Mannich reaction. 
     
     
       4. The precipitation inhibitor according to  claim 1 , wherein M is an alkali metal or ammonium. 
     
     
       5. A method for inhibiting scale formation in water, the method comprising the step of adding to the water a scale inhibitor comprising at least one polymethylenephosphonate derivative having the following formula: 
       
         
           
           
               
               
           
         
         wherein n is an integer comprised between 2 and 15000, 
         wherein M is hydrogen or a cation, 
         wherein R 1 , R 2 , and R 3  are each independently selected from the group consisting of,
 CH 2 PO 3 M 2 , 
 CH 2 R 4 , wherein R 4  is CHOHCH 3 , CHOHCH 2 Cl, or CHOHCH 2 OH, 
 (CH 2 ) m SO 3 M, wherein m is 3 or 4, and 
 CH 2 CH 2 R 5 , wherein R 5  is CONH 2 , CHO, COOR 6 , COOX, or CN, wherein R 6  is CH 3  or C 2 H 5 , and wherein X is a an alkali metal or ammonium, and 
 
         wherein at least one of R 1 , R 2 , and R 3  is not CH 2 PO 3 M 2 . 
       
     
     
       6. The method according to  claim 5 , further comprising the step of precipitating the polymethylenephosphonate derivative on a metal surface in contact with the water, thereby preventing corrosion of the metal surface. 
     
     
       7. A method for sequestering iron ions in a water system, the method comprising the step of providing the water in the water system with a scale inhibitor comprising at least one polymethylenephosphonate derivative having the following formula: 
       
         
           
           
               
               
           
         
         wherein n is an integer comprised between 2 and 15000, 
         wherein M is hydrogen or a cation, 
         wherein R 1 , R 2 , and R 3  are each independently selected from the group consisting of,
 CH 2 PO 3 M 2 , 
 CH 2 R 4 , wherein R 4  is CHOHCH 3 , CHOHCH 2 Cl, or CHOHCH 2 OH, 
 (CH 2 ) m SO 3 M, wherein m is 3 or 4, and 
 CH 2 CH 2 R 5 , wherein R 5  is CONH 2 , CHO, COOR 6 , COOX, or CN, wherein R 6  is CH 3  or C 2 H 5 , and wherein X is an alkali metal or ammonium, and 
 
         wherein at least one of R 1 , R 2 , and R 3  is not CH 2 PO 3 M 2 .